<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    textarea {
      /* vertical让形变只能是垂直形变，就是只能上下拉伸，不可左右拉伸 */
      /* horizontal就是水平拉伸 */
      resize: horizontal;
    }
  </style>
</head>
<body>
  
  <form action="">
    <label for="info">
      个人描述:
      <textarea name="info" id="info" cols="10" rows="6"></textarea>
    </label>
  </form>

</body>
</html>